Using A Transistor To Change Polarity
Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=147487
Printed Date: April 19, 2024 at 8:19 AM
Topic: Using A Transistor To Change Polarity
Posted By: blacklion62
Subject: Using A Transistor To Change Polarity
Date Posted: October 29, 2022 at 3:42 PM
Hello. My bank of relays are all wired for negative triggers. I recently came across a YouTube video to use a SPDT switch to either switch LED Pods reverse lights on with the stock lights, or to turn them on manually. However, the circuit uses the +12 wire from the stock backup lights to drive the LED Pods, switchinng the positive. I really don't want to run another relay just to switch the polarity. I know a NPN transistor would do the job. I need to know which transistor to use, and a diagram to hook it up. +12V switching -12V, to send a negative trigger signal to the LED Pods relay.
Thank you all for your help.
James
Replies:
Posted By: Ween
Date Posted: October 30, 2022 at 4:07 PM
This should help...https://electronicsclub.info/transistorcircuits.htm
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